فهرست مطالب علی هراتی

Today, shift working is a common in many developed countries cause industrial development and implement of service organization. This study attempts to determine the relationship between shift working and blood parameters among employees of a petrochemical company. In a cross-sectional study, the study was done with 403 workers from a petrochemical company, Iran in 1394. Employees were divided into two groups of day working and shift working. Blood samples were taken from participant in the workplace by expert. For more accurate of assess alters metabolism in body, hematological indexes were analyzed for fasting plasma glucose, triglyceride, cholesterol, LDL, HDL, liver enzymes such SGOT, SGPT and complete blood cell. Blood pressure were taken from both day workers and shift workers by standard method. The mean of these parameters was compared in two groups. The mean age of participants in this study was 32.02 ± 7.6 years, the mean age of day workers 33.16 ± 8.3 years and shift workers was 31.5 ±7.3 years. The group with age higher than 50 years old had the highest average systolic blood pressure 11.71 ± 0.61 mm/Hg and diastolic blood pressure 7.2 ± 0.69 mm/Hg compare to the other aged groups. The results of statistical tests showed significant difference between the systolic and diastolic blood pressure in the day and shift working people (P<0.05). The mean of SGPT in shift workers were lower than day workers, while no significant difference was seen between liver enzymes SGOT and SGPT in two groups (P>0.05). The mean of RBC and WBC in day workers were higher than shift workers, but did no showed significant difference between RBC and WBC in two groups (P>0.05). The statistical tests results showed significant difference between the glucose, triglyceride, cholesterol and LDL in the day workers and shift workers (P<0.05). Also, significant difference was seen between MCV, RBC and SGPT with systolic blood pressure in shift workers (P<0.05). The circadian rhythm and metabolic indices can be changed by shift working, resulting in significantly more risk factors for cardiovascular disorders and digestive problems

In recent years, many national and international expert groups have considered specific improvements in risk assessment of chemical pollutants. This study considered to assess the risk of workers exposure to air pollutants in an automobile manufacturing in order to evaluate the health risk assessment due to the inhalation exposure.
Material and To perform this study, a cross-sectional research was done in 2016. Methods number 1501 and 7602 of the National Institute of occupational safety and Health (NIOSH) were used for sampling and analysis of compounds BTEX and silica in the air. A total of 40 samples of compound BTEX were taken and analyzed by Gas Chromatography-Flame Ionization Detector (GC-FID). A total of 6 samples of silica were collected during the campaign. Silica analyses were performed by using visible spectrophotometry. Risk ranking was calculated using the hazard and exposure rate. Finally, the relative risk of blood cancer caused by exposure to benzene was estimated.
The result demonstrated that, workers were exposed to 5 chemicals including silica, benzene, toluene, ethyl-benzene, and xylene during their work in manufactory. Among the pollutants in the breathing zone of workers, Silica and benzene were hazardous chemicals at high risk level. Following the estimation of relative risk of blood cancer caused by exposure to benzene, workers cumulative exposure to benzene was obtained to be 23.1 ppm per year and the capture relative risk was 1.1. The consequence demonstrated that, significant relationships were seen between workers exposure to benzene and both age and work experience, so that degree of exposure decreased steadily with increasing age and experience (P This research demonstrated that, benzene and silica in the automobile manufacturing were the highest risk. Also, painting hall workers, at automobile manufacturing, were directly exposed to the blood cancer risk of benzene.